Rinnai hot water heater

Mike McGonigal

I will be installing a radaint floor heating system in my house next summer. I have a Rinnai continuum continuous hot water heater right now. I am thinking of using it for my heat source it's rated to 180,000 btu's. I will be using a heat exchanger for the radaint system. Does anyone have any comments or advice.

larry

Can't comment on the technical aspects of this type of setup, but you might take a look at your Rinnai warranty and that might give you an indication of what Rinnai thinks of this use for their equipment. If I remember the heat exchanger goes from a 10 year warranty to 3 years, and other parts go from 5 years to 3 years.

johnnyd

Check with your AHJ, and/or insurance company, but I believe the water heater needs to be listed for space heating purpose, and there are subtle but probably important changes made to the "SH" (for Space Heat) line of Seiscos.

Alan(CaliforniaRadiant)Forbes

Last time

I checked, only the commercial model was certified for hydronic applications (don't know why).

The manufacturer specifies a pump that can handle 6 gpm @ 30 feet of head to overcome the pressure drop of the heat exchanger; that's a BIG pump that costs a lot to operate. You should factor this in when determining overall efficiency.

If you've got over 1,000 [] of space to heat, I would recommend a good quality, high efficiency boiler like a Munchkin.

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Mike McGonigal

I was planning on using just one pump for the system with 3-way valves for zone control anyway but that is good info.

Mike McGonigal

I was planning on using just one pump for the system with 3-way valves for zone control anyway but that is good info. The problem is I'm limited on space for the boiler the rinnai is wall hung and paid for.